Shipping plants in cold weather

I wasn't really sure where to put this, so if it needs moved, feel free.

I have bought plants from the S&S forum before on a few occasions, but I have never shipped plants and I've never shipped anything in the winter. I just agreed to send some plants to someone, but I'm a bit worried about the cold. I checked the forecast for both my region and the region I'll be sending the plants to and both areas will be above freezing, but still in the high 30's - low 40's at night. I still see lots of plants for sale in the S&S forum, so I'm wondering how the people selling those plants ensure they get to their destination in good shape while still using priority flat-rate shipping.

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When I can no more stir my soul to move, and life is but the ashes of a fire
When I can but remember that my heart once used to live and love, long and aspire
Oh, be thou then the first, the one thou art, be thou the calling, before all answering love
And in me wake hope, fear, boundless desire.

When I can no more stir my soul to move, and life is but the ashes of a fire
When I can but remember that my heart once used to live and love, long and aspire
Oh, be thou then the first, the one thou art, be thou the calling, before all answering love
And in me wake hope, fear, boundless desire.

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